JP7621176B2 - Earthquake-resistant reinforcement structure - Google Patents

Description

The present invention relates to earthquake-resistant reinforcement structures.

A seismic reinforcement structure is known in which external reinforcement columns and external reinforcement beams are provided on the outside of the existing perimeter columns and existing perimeter beams, respectively (see, for example, Patent Documents 1 and 2).

JP 2015-098780 A JP 2010-159543 A

However, in an existing structure that has above-ground and underground structures, when installing an external reinforcing column that spans the above-ground and underground structures on the outside of the existing outer perimeter columns, it is necessary to excavate the ground outside the underground structure, making the construction of the external reinforcing column time-consuming.

Taking the above facts into consideration, the present invention aims to improve the seismic performance of existing structures that have above-ground and underground structures while also improving workability.

The earthquake-resistant reinforcement structure according to claim 1 includes an existing structure having an underground structure and a ground structure composed of multiple floors, an outer reinforcement column provided outside an existing outer perimeter column of the above-ground structure,
The structure is provided with an inner reinforcement column that is provided inside the existing outer periphery column, spans the underground structure and the lower floor of the above-ground structure, and faces the outer reinforcement column on the lower floor, sandwiching the existing outer periphery column therebetween.

According to the earthquake-resistant reinforcement structure of claim 1, the existing structure has an underground structure and an above-ground structure consisting of multiple floors. An outer reinforcing column is provided on the outside of the existing outer perimeter column of the above-ground structure. In addition, an outer reinforcing beam is provided on the outside of the existing outer perimeter beam of the above-ground structure. This outer reinforcing beam is joined to the outer reinforcing column. By reinforcing the outer wall surface of the above-ground structure with these outer reinforcing columns and outer reinforcing beams, it is possible to improve the earthquake resistance performance of the existing structure while ensuring the opening ratio of the outer wall surface of the above-ground structure.

In addition, an inner reinforcing column is provided inside the existing outer perimeter column on which the outer reinforcing column is provided. The inner reinforcing column spans the underground structure and the lower floor of the above-ground structure, and faces the outer reinforcing column on the lower floor, sandwiching the existing outer perimeter column therebetween.

As a result, for example, during an earthquake, the pull-out force acting on the above-ground structure is transmitted from the outer reinforcing column via the existing outer perimeter column to the inner reinforcing column on the lower floor of the above-ground structure. The pull-out force transmitted to the inner reinforcing column is then transmitted from the inner reinforcing column to the underground structure. This improves the earthquake resistance of the existing structure.

In addition, with the present invention, there is no need to excavate the ground outside the underground structure and install external reinforcement columns outside the existing outer perimeter columns of the underground structure. This improves workability.

In this way, the present invention can improve the earthquake resistance of existing structures while also improving workability.

The earthquake-resistant reinforcement structure described in claim 2 is the earthquake-resistant reinforcement structure described in claim 1, which includes a plurality of outer reinforcement columns each provided on the outside of a plurality of existing outer peripheral columns arranged along one outer wall surface of the ground structure, and outer reinforcement beams provided on the outside of existing outer peripheral beams arranged along the outer wall surface of the ground structure and span adjacent outer reinforcement columns, and the inner reinforcement columns are each provided on the inside of the existing outer peripheral columns located at both ends of one outer wall surface.

According to the earthquake-resistant reinforcement structure of claim 2, the multiple outer reinforcement columns are each provided on the outside of multiple existing outer perimeter columns arranged along one outer wall surface of the ground structure. In addition, the outer reinforcement beams are provided on the outside of the existing outer perimeter beams arranged along one outer wall surface of the ground structure and are erected on the adjacent outer reinforcement columns. By reinforcing one outer wall surface of the ground structure with these outer reinforcement columns and outer reinforcement beams, it is possible to improve the earthquake resistance performance of the existing structure while ensuring the opening ratio of the outer wall surface.

Here, during an earthquake, a large pull-out force is applied to the existing outer perimeter columns located at both ends of one of the outer wall surfaces of the above-ground structure due to the overturning moment. As a countermeasure to this, in the present invention, inner reinforcing columns are provided on the inside of each of the existing outer perimeter columns located at both ends of one of the outer wall surfaces of the above-ground structure. The inner reinforcing columns span the lower floors of the above-ground structure and the underground structure.

As a result, during an earthquake, the pull-out force acting on the existing outer perimeter columns located at both ends of one of the exterior wall faces is transmitted to the existing outer perimeter columns of the underground structure via the inner reinforcing columns. This makes it possible to efficiently improve the earthquake resistance of the existing structure.

The earthquake-resistant reinforcement structure described in claim 3 is the earthquake-resistant reinforcement structure described in claim 1 or claim 2, in which the outer perimeter wall connected to the portion of the existing outer perimeter column sandwiched between the inner reinforcement column and the outer reinforcement column on the lower floor of the above-ground structure is a seismic wall.

According to the earthquake-resistant reinforcement structure of claim 3, the outer perimeter wall connected to the portion of the existing outer perimeter column sandwiched between the inner reinforcement column and the outer reinforcement column on the lower floor of the above-ground structure is a seismic wall. In other words, a seismic wall is provided on the lower floor of the above-ground structure.

Here, the existing outer perimeter columns on the lower floors of the above-ground structure become the transmission path that transmits the pull-out force generated by the overturning moment during an earthquake to the inner reinforcing columns. Therefore, if the existing outer perimeter columns on the lower floors of the above-ground structure are made to bear the seismic force (horizontal force), for example, there is a possibility that the required cross-sectional area of the outer reinforcing columns that reinforce the existing outer perimeter columns will be larger than the required cross-sectional area of the outer reinforcing columns on the upper floors of the above-ground structure.

As a countermeasure to this, in the present invention, as mentioned above, earthquake-resistant walls are provided on the lower floors of the above-ground structure. These earthquake-resistant walls bear the seismic force acting on the lower floors of the above-ground structure, thereby reducing the seismic force borne by the existing outer perimeter columns of the lower floors.

This allows, for example, for the external reinforcing column that reinforces the existing external perimeter column on the lower floor of the above-ground structure to transmit a pull-out force from the existing external perimeter column to the internal reinforcing column during an earthquake without increasing the required cross-sectional area of the external reinforcing column.

As described above, according to the present invention, in an existing structure having above-ground and underground structures, it is possible to improve the earthquake resistance of the existing structure while improving its workability.

FIG. 2 is an elevational view showing one exterior wall surface of an existing structure to which the earthquake-resistant reinforcement structure according to this embodiment is applied. This is a cross-sectional view taken along line 2-2 of Figure 1. This is a cross-sectional view taken along line 3-3 in Figure 1. This is a cross-sectional view taken along line 4-4 in Figure 1. This is a cross-sectional view taken along line 5-5 in Figure 1. This is a cross-sectional view taken along line 6-6 in Figure 1. This is a cross-sectional view taken along line 7-7 in Figure 1.

Below, we will explain an earthquake-resistant reinforcement structure according to one embodiment, with reference to the drawings.

(Existing structure)
1 shows one exterior wall surface 10W of an existing structure 10 to which the earthquake-resistant reinforcement structure according to this embodiment is applied. The existing structure 10 includes an existing foundation 12, a plurality of existing outer periphery columns 20, and a plurality of existing outer periphery beams 30.

In addition, the arrow X shown in each figure indicates the width direction of one of the multiple exterior wall surfaces 10W of the existing structure 10. Furthermore, the arrow Y indicates the direction perpendicular to one of the exterior wall surfaces 10W of the existing structure 10 (depth direction). Furthermore, the arrow Z indicates the height direction (up and down direction) of the existing structure 10.

The existing foundation 12 is a foundation base slab (spread foundation) laid at the bottom of the excavated ground G. A number of existing outer perimeter columns 20 are erected on the existing foundation 12. The multiple existing outer perimeter columns 20 are arranged along the outer wall surface 10W of the existing structure 10, and are spaced apart in the width direction of the outer wall surface 10W.

The existing foundation 12 is not limited to a direct foundation, but may be a pile foundation, etc.

As shown in FIG. 2, the existing outer perimeter column 20 is made of steel-reinforced concrete. An internal steel frame 22, a plurality of column main reinforcements 24, and a plurality of shear reinforcement bars 26 are embedded inside the existing outer perimeter column 20. The internal steel frame 22 is, for example, a cross H-shaped steel. Note that the existing outer perimeter column 20 is not limited to steel-reinforced concrete construction, and may be made of reinforced concrete.

As shown in FIG. 1, multiple existing perimeter beams 30 are installed on adjacent existing perimeter columns 20. The multiple existing perimeter beams 30 are arranged along the exterior wall surface 10W. The multiple existing perimeter beams 30 are installed on adjacent existing perimeter columns 20 with vertical spacing between them so as to correspond to each floor of the existing structure 10. These existing perimeter beams 30 and existing perimeter columns 20 form a frame (rigid frame) 14. The frame 14 has an opening 16 on its inside.

As shown in FIG. 3, the existing perimeter beam 30 is made of steel-reinforced concrete. An internal steel frame 32, multiple beam main bars 34, and multiple shear reinforcement bars 36 are embedded inside the existing perimeter beam 30. The internal steel frame 32 is, for example, an H-shaped steel. Note that the existing perimeter beam 30 is not limited to being made of steel-reinforced concrete, and may be made of reinforced concrete.

As shown in FIG. 1, the existing structure 10 has an underground structure 10B and an above-ground structure 10A. The underground structure 10B is the portion of the existing structure 10 that is located underground. This underground structure 10B is made up of multiple floors.

As shown in FIG. 4, the underground structure 10B has the existing foundation 12 and the existing underground exterior wall 18. The existing underground exterior wall 18 is provided along the exterior wall surface 10W of the existing structure 10. This existing underground exterior wall 18 bears the earth pressure as a retaining wall.

The underground structure 10B is not limited to having multiple floors, and can be constructed with at least one floor.

The ground structure 10A is the portion of the existing structure 10 that is placed on the ground. This ground structure 10A is composed of multiple floors. The outer wall surface 10W of this ground structure 10A is reinforced by an outer shell reinforcement frame.

(Outer shell reinforcement frame)
As shown in Fig. 1, the outer shell reinforcement frame has a plurality of outer reinforcement columns 40 and a plurality of outer reinforcement beams 50 that are installed between adjacent outer reinforcement columns 40. The plurality of outer reinforcement columns 40 are each provided outside the existing outer periphery columns 20 on the outer wall surface 10W of the ground structure 10A.

(External reinforcement column)
Each of the outer reinforcement columns 40 is provided from the first floor F1 to the top floor of the ground structure 10A. As shown in Fig. 4, the column base 40L of each of the outer reinforcement columns 40 is not buried in the ground G, but is disposed outside the column base 20L of the existing outer periphery column 20 on the first floor F1 of the ground structure 10A.

As shown in FIG. 2, the outer reinforcing column 40 is made of steel-reinforced concrete. An inner steel frame 42, a plurality of column main bars 44, and a plurality of shear reinforcement bars 46 are embedded inside the outer reinforcing column 40. The inner steel frame 32 is, for example, an H-shaped steel.

The outer reinforcing column 40 is arranged along the existing outer periphery column 20. The width of the outer reinforcing column 40 (width in the direction of arrow X) is wider than the width of the existing outer periphery column 20. This outer reinforcing column 40 is joined to the outer surface of the existing outer periphery column 20 via a plurality of post-installed anchors 48. Of the plurality of post-installed anchors 48, some of the post-installed anchors 48 are welded to the flanges of the internal steel frame 22 of the existing outer periphery column 20. The existing outer periphery column 20 is reinforced by this outer reinforcing column 40.

The width of the outer reinforcing column 40 can be changed as appropriate, and may be the same as the width of the existing outer periphery column 20, or may be narrower than the width of the existing outer periphery column 20. The joint structure between the outer reinforcing column 40 and the existing outer periphery column 20 is not limited to the post-installed anchor 48, and can be changed as appropriate. Furthermore, the outer reinforcing column 40 is not limited to steel-reinforced concrete construction, and may be reinforced concrete construction or steel frame construction.

As shown in FIG. 3, the outer reinforcing beam 50 is made of steel-reinforced concrete. An inner steel frame 52, a plurality of beam main bars 54, and a plurality of shear reinforcement bars 56 are embedded inside the outer reinforcing beam 50. The inner steel frame 32 is, for example, an H-shaped steel.

(Outer reinforcement beam)
The outer reinforcing beam 50 is disposed along the existing outer periphery column 20. The beam depth and beam width of the outer reinforcing beam 50 are wider than those of the existing outer periphery beam 30. The outer reinforcing beam 50 is joined to the outer surface of the existing outer periphery beam 30 via a plurality of post-installed anchors 58 and additional concrete 60. The outer reinforcing beam 50 reinforces the existing outer periphery beam 30.

The beam height and beam width of the outer reinforcing beam 50 can be changed as appropriate, and may be the same as the beam height and beam width of the existing outer periphery beam 30, or may be shorter than the beam height and beam width of the existing outer periphery beam 30. The joint structure between the outer reinforcing beam 50 and the existing outer periphery beam 30 is not limited to the post-installed anchors 58 and the added concrete 60, and can be changed as appropriate. The added concrete 60 can be omitted as appropriate. Furthermore, the outer reinforcing beam 50 is not limited to steel-reinforced concrete construction, and may be reinforced concrete construction or steel frame construction.

(Inner reinforcing beam)
Here, as shown in Figure 1, during an earthquake, a large pull-out force P acts on both ends in the width direction of the exterior wall surface 10W of the existing structure 10 (hereinafter referred to as the "existing corner column 20C"), i.e., on the existing outer peripheral columns 20 located at the corners of the existing structure 10, due to the overturning moment M.

As a countermeasure to this, in this embodiment, inner reinforcement columns 70 are provided. The inner reinforcement columns 70 span the first floor F1 of the above-ground structure 10A and the first basement floor B1 of the underground structure 10B. As a result, during an earthquake, the pull-out force P acting on the existing corner column 20C is transmitted to the underground structure 10B via the inner reinforcement columns 70.

The first floor F1 of the ground structure 10A is an example of a lower floor of the ground structure 10A.

As shown in FIG. 4, the inner reinforcing column 70 is provided along the inner surface of the existing corner column 20C. The column capital 70U of this inner reinforcing column 70 is located inside the column capital 20U of the existing corner column 20C on the first floor F1 of the above-ground structure 10A. On the other hand, the column base 70L of the inner reinforcing column 70 is located inside the column base 20L of the existing corner column 20C on the first basement floor B1 of the underground structure 10B.

The inner reinforcement column 70 faces the outer reinforcement column 40 across the existing corner column 20C on the first floor F1 of the ground structure 10A. In other words, on the first floor F1 of the ground structure 10A, the existing corner column 20C is sandwiched between the outer reinforcement column 40 and the inner reinforcement column 70 on both sides in the out-of-plane direction (arrow Y direction) of the exterior wall surface 10W.

As shown in FIG. 5, the inner reinforcing column 70 is made of reinforced concrete. A number of main column reinforcements 74 and a number of shear reinforcements 76 are embedded inside the inner reinforcing column 70.

The width of the inner reinforcement column 70 (width in the direction of the arrow X) is approximately the same as the width of the existing corner column 20C. The vertical width of the inner reinforcement column 70 (width in the direction of the arrow Y) is wider than the vertical width of the existing corner column 20C. This inner reinforcement column 70 is joined to the inner surface of the existing corner column 20C via multiple post-installed anchors 78 on the first floor F1 of the ground structure 10A. Some of the multiple post-installed anchors 78 are welded to the flanges of the internal steel frame 22 of the existing corner column 20C.

Similarly, as shown in FIG. 6, the inner reinforcing column 70 is joined to the inner surface of the existing corner column 20C via a plurality of post-installed anchors 78 on the first basement floor B1 (see FIG. 1) of the underground structure 10B. Some of the post-installed anchors 78 are welded to the flanges of the internal steel frame 22 of the existing corner column 20C.

The multiple post-installed anchors 78 are spaced apart in the material axis direction of the inner reinforcing column 70. The multiple post-installed anchors 78 are also installed over the entire length of the inner reinforcing column 70 in the material axis direction. The inner reinforcing columns 70 reinforce the existing corner columns 20C on the first floor F1 of the above-ground structure 10A and the first basement floor B1 of the underground structure 10B.

As shown in FIG. 4, the inner reinforcement column 70 runs from the first floor F1 of the above-ground structure 10A through the slab 94 of the first floor F1 to the first basement floor B1 of the underground structure 10B. The end 90E of the existing outer periphery orthogonal beam 90 supporting the slab 94 of the first floor F1 of the above-ground structure 10A is embedded in the inner reinforcement column 70. The existing outer periphery orthogonal beam 90 is an existing outer periphery beam that is perpendicular to the existing outer periphery beam 30.

As shown in FIG. 7, the existing outer periphery orthogonal beam 90 is made of steel-reinforced concrete. Inside this existing outer periphery orthogonal beam 90, an internal steel frame 92 and multiple beam main reinforcements and shear reinforcements (not shown) are buried.

The width of the inner reinforcing column 70 is wider than the beam width of the existing outer periphery orthogonal beam 90. The column main reinforcement 74 of the inner reinforcing column 70 is arranged on both sides of the existing outer periphery orthogonal beam 90 in the beam width direction. In addition, the existing outer periphery orthogonal beam 90 and the inner reinforcing column 70 are connected by braced bars 80 as shear reinforcement surrounding the column main reinforcement 74.

(earthquake-resistant walls)
As shown in Fig. 1, a seismic wall 100 is provided on each of the frames 14 at both ends of the exterior wall surface 10W on the first floor F1 of the ground structure 10A. The seismic wall 100 is made of, for example, reinforced concrete. The seismic wall 100 is connected to the existing corner column 20C, the existing outer periphery column 20, and the upper and lower existing outer periphery beams 30 that constitute the frame 14. The seismic wall 100 is connected to a portion of the existing corner column 20C that is sandwiched between the outer reinforcement column 40 and the inner reinforcement column 70.

The earthquake-resistant wall 100 mainly bears the seismic force (horizontal force) in the width direction (arrow X direction) of the exterior wall surface 10W of the existing structure 10. This earthquake-resistant wall 100 reduces the seismic force borne by the existing corner column 20C of the first floor F1 of the ground structure 10A.

The earthquake-resistant wall 100 is not limited to being made of reinforced concrete, but may be made of steel, etc.

(Action)
Next, the operation of this embodiment will be described.

As shown in FIG. 1, according to the earthquake-resistant reinforcement structure of this embodiment, an existing structure 10 has an underground structure 10B and an above-ground structure 10A consisting of multiple floors. One outer wall surface 10W of the above-ground structure 10A is reinforced by an outer shell reinforcement frame.

Specifically, the outer shell reinforcement frame has a plurality of outer reinforcement columns 40 and a plurality of outer reinforcement beams 50. The plurality of outer reinforcement columns 40 are each provided on the outside of a plurality of existing outer perimeter columns 20 arranged along one outer wall surface 10W of the ground structure 10A.

The outer reinforcing beams 50 are provided on the outside of each of the multiple existing outer peripheral beams 30 arranged along one of the outer wall surfaces 10W of the ground structure 10A, and are erected on the adjacent outer reinforcing columns 40. By reinforcing the outer wall surface 10W of the ground structure 10A with these outer reinforcing columns 40 and outer reinforcing beams 50, the opening ratio of the openings 16 on the outer wall surface 10W can be ensured while improving the seismic performance of the existing structure 10.

As mentioned above, during an earthquake, a large pull-out force P acts on the existing corner columns 20C located at both ends of the outer wall surface 10W of the ground structure 10A due to the overturning moment M.

As a countermeasure, for example, it is possible to excavate the ground G outside the existing corner column 20C in the underground structure 10B and provide an outer reinforcing column 40 on the outside of the existing corner column 20C. However, in this case, excavating the ground G is time-consuming.

In contrast, in this embodiment, as shown in FIG. 4, an inner reinforcing column 70 is provided inside the existing corner column 20C. The inner reinforcing column 70 spans the first floor F1 of the above-ground structure 10A and the first basement floor B1 of the underground structure 10B, and faces the outer reinforcing column 40 on the first floor F1, sandwiching the existing outer perimeter column 20 between them.

As a result, for example, during an earthquake, the pull-out force P acting on the above-ground structure 10A is transmitted from the outer reinforcement column 40 to the inner reinforcement column 70 via the existing corner column 20C on the first floor F1 of the above-ground structure 10A. The pull-out force P transmitted to the inner reinforcement column 70 is transmitted from the inner reinforcement column 70 to the existing foundation 12 via the existing corner column 20C of the underground structure 10B and the existing underground outer wall 18.

Therefore, in this embodiment, the earthquake resistance performance of the existing structure 10 can be improved without excavating the ground G outside the underground structure 10B and installing an outer reinforcing column 40 outside the existing corner column 20C. Therefore, workability can be improved.

The existing underground exterior wall 18 also functions as a retaining wall, and therefore has high bearing strength. Therefore, even if no inner reinforcing columns 70 are provided below the second basement floor of the underground structure 10B, the pull-out force P is transmitted to the existing foundation 12 via the existing corner columns 20C and the existing underground exterior wall 18.

In this way, this embodiment can improve the earthquake resistance of the existing structure 10 while also improving workability.

In addition, an earthquake-resistant wall 100 is provided on the outer wall surface 10W of the first floor F1 of the ground structure 10A. The earthquake-resistant wall 100 is provided, for example, on each of the frames 14 on both ends of the outer wall surface 10W, and is connected to the existing corner columns 20C of the first floor F1.

Here, the existing corner column 20C on the first floor F1 of the ground structure 10A becomes the transmission path that transmits the pull-out force P generated by the overturning moment M during an earthquake to the inner reinforcement column 70. Therefore, if the existing corner column 20C on the first floor F1 of the ground structure 10A is made to bear the earthquake force (horizontal force in the direction of the arrow X), for example, there is a possibility that the required cross-sectional area of the outer reinforcement column 40 that reinforces the existing corner column 20C will be larger than the required cross-sectional area of the outer reinforcement column 40 on the upper floor of the ground structure 10A.

As a countermeasure to this, in this embodiment, as described above, a seismic wall 100 is provided on the first floor F1 of the ground structure 10A. This seismic wall 100 bears the seismic force (horizontal force in the direction of arrow X) acting on the first floor F1 of the ground structure 10A, thereby reducing the seismic force borne by the existing corner column 20C of the first floor F1.

This allows, for example, the pull-out force P to be transmitted from the existing corner column 20C to the inner reinforcement column 70 during an earthquake without increasing the required cross-sectional area of the outer reinforcement column 40 on the first floor F1 of the ground structure 10A.

(Modification)
Next, a modification of the above embodiment will be described.

In the above embodiment, earthquake-resistant walls 100 are provided on both ends of the frame 14 on the exterior wall surface 10W of the first floor F1 (lower floor) of the ground structure 10A. However, the number and arrangement of earthquake-resistant walls 100 can be changed as appropriate. Therefore, for example, earthquake-resistant walls 100 may be provided on all frames 14 on the exterior wall surface 10W of the first floor F1, or earthquake-resistant walls 100 may be provided only on the central frame 14 on the exterior wall surface 10W of the first floor F1. It is also possible to provide earthquake-resistant walls 100 on the frames 14 on the exterior wall surfaces 10W of the second floor or higher of the ground structure 10A. Furthermore, earthquake-resistant walls 100 may be provided as necessary and may be omitted as appropriate.

In addition, in the above embodiment, the inner reinforcing columns 70 are provided across the first floor F1 of the above-ground structure 10A and the first basement floor B1 of the underground structure 10B. However, the inner reinforcing columns 70 may be provided across, for example, the lower floors of the above-ground structure 10A and the second basement floor and below of the underground structure 10B.

The lower floor of the ground structure 10A here refers to, for example, a floor that is 1/3 or less of the ground structure 10A. In this case, a seismic wall 100 can be appropriately provided on the frame 14 of one of the exterior wall surfaces 10W on the lower floor of the ground structure 10A where the inner reinforcing column 70 is provided.

In the above embodiment, the inner reinforcing column 70 is provided inside the existing corner column 20C on the outer wall surface 10W of the ground structure 10A. However, the number and arrangement of the inner reinforcing columns 70 can be changed as appropriate, and for example, they may be provided inside an existing outer perimeter column (existing side column) 20 other than the existing corner column 20C on the outer wall surface 10W of the ground structure 10A. Also, at least one inner reinforcing column 70 can be provided in the existing structure 10.

In addition, in the above embodiment, multiple outer reinforcing beams 50 are provided on one outer wall surface 10W of the ground structure 10A. However, the number and arrangement of the outer reinforcing beams 50 can be changed as appropriate. Furthermore, the outer reinforcing beams 50 can be provided as needed, and can be omitted as appropriate.

In addition, in the above embodiment, multiple outer reinforcement columns 40 are provided on one outer wall surface 10W of the ground structure 10A. However, the number and arrangement of the outer reinforcement columns 40 can be changed as appropriate. In addition, at least one outer reinforcement column 40 can be provided on one outer wall surface 10W of the ground structure 10A.

The earthquake-resistant reinforcement structure according to the above embodiment is applied to one outer wall surface 10W of the ground structure 10A. However, the earthquake-resistant reinforcement structure according to the above embodiment can be applied to at least one of the multiple outer wall surfaces of the ground structure 10A.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and one embodiment and various modified examples may be used in appropriate combination, and the present invention may of course be embodied in various forms without departing from the spirit of the present invention.

10 Existing structure 10A Ground structure 10B Underground structure 10W Outer wall surface (one outer wall surface of the ground structure)
20 Existing outer periphery column 20C Existing corner column (existing outer periphery column located at both ends of one outer wall surface of the ground structure)
30 Existing peripheral beam 40 Outside reinforcement column 50 Outside reinforcement beam 70 Inside reinforcement column 100 Earthquake wall F1 First floor (lower floor of ground structure)

Claims (3)

An existing structure having an underground structure and an above-ground structure composed of multiple floors;
An outer reinforcing column provided on the outside of the existing outer perimeter column of the ground structure;
An inner reinforcing column is provided inside the existing outer periphery column, spanning the underground structure and the lower floor of the above-ground structure, and facing the outer reinforcing column on the lower floor across the existing outer periphery column;
Earthquake-resistant reinforcement structure. A plurality of the outer reinforcing columns are provided on the outside of the plurality of existing outer perimeter columns arranged along one outer wall surface of the ground structure;
An outer reinforcing beam provided on the outer side of an existing outer periphery beam arranged along the outer wall surface of the ground structure and installed on the adjacent outer reinforcing column;
Equipped with
The inner reinforcing columns are provided on the inside of the existing outer periphery columns located at both ends of the one outer wall surface,
The earthquake-resistant reinforcement structure according to claim 1. In the lower floor of the above-ground structure, an outer perimeter wall connected to a portion of the existing outer perimeter column sandwiched between the inner reinforcement column and the outer reinforcement column is a seismic wall.
The earthquake-resistant reinforcement structure according to claim 1 or 2.